Certain substituted 2-phenylnaphtho[1,2-b]furane and -[2,1-b]furane

Abstract

2-Phenylnaphtho[1,2-b]furan, 2-phenylnaphtho[2,1-b]-furan and derivatives thereof substituted in the phenyl ring by alkyl, halo or cyano are useful as antifertility agents, and are prepared by cyclization of a naphthyloxyacetophenone with a strong acid.

We claim: 
     
       1. A compound of the formula ##STR7## wherein R is halo and R' is hydrogen, bromo or nitro. 
     
     
       2. A compound according to claim 1 wherein R is p-halo and R' is hydrogen. 
     
     
       3. 2-(p-Bromophenyl)naphtho[1,2-b]furan, according to claim 2. 
     
     
       4. 2-(p-Bromophenyl)naphtho[2,1-b]furan, according to claim 2. 
     
     
       5. 2-(p-Chlorophenyl)naphtho[2,1-b]furan, according to claim 2. 
     
     
       6. 3-Bromo-2-(p-bromophenyl)naphtho[1,2-b]furan, according to claim 1. 
     
     
       7. 2-(p-Bromophenyl)-3-nitronaphtho[1,2-b]furan, according to claim 1.